$\left(y^{-4}\right)^1$
$cotg4\:+\:cotg2\:$
$4tan\left(x\right)-7=3tan\left(x\right)-6$
$x^2-8x=10$
$\lim_{x\to\pi}\left(\frac{1+\cos\left(2\right)x}{1-\sin\left(x\right)}\right)$
$2x^2-4x+1>0$
$q\left(x\right)=\:2x-x^3+3x^4\:6\:\:\:\:\:\:$
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